että: The 'that' Clause | Finnish Grammar

että is Finnish for "that" as a complementiser — the little word that attaches a whole reported clause to a verb of thinking, saying, hoping, or knowing: I think *that he's coming. It also builds result clauses with *niin … että ("so … that"). Two things trip up English speakers here: the comma that Finnish always puts before että, and the fact that että is not the word for indirect yes/no questions. This page sorts both out.

että after verbs of thinking and saying

Verbs like tietää ("know"), sanoa ("say"), luulla ("think, suppose"), toivoa ("hope"), and uskoa ("believe") take a complement clause introduced by että. The clause keeps a finite verb and normal word order — nothing gets inverted or reshuffled.

Luulen, että hän tulee.

I think that she's coming.

Sanon, että tulen.

I'm saying that I'll come.

Hän sanoi, että kaikki on hyvin.

He said that everything is fine.

Toivon, että sinulla on hyvä matka.

I hope you have a good trip.

Crucially, there is a comma before että every time. Finnish punctuates the boundary between the main clause and the subordinate clause, so the comma is not optional the way English "that" often is.

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English lets you drop both the comma and the word "that": I think he's coming. Finnish allows neither in careful writing — the comma before että is required, and the word itself is normally kept. Missing that comma is the single most common punctuation error learners make.

niin … että: "so … that" (result)

niin … että expresses a result: something is so intense that a consequence follows. niin sits with the adjective or adverb in the first clause; että introduces the consequence.

Olin niin väsynyt, että nukahdin heti.

I was so tired that I fell asleep at once.

Hän puhui niin nopeasti, että en ymmärtänyt mitään.

He spoke so fast that I didn't understand anything.

The comma still lands before että. This construction is extremely common in everyday speech for describing degrees ("so cold that…", "so happy that…").

että vs jotta: result vs purpose

Do not confuse the result niin … että with jotta, which marks purpose ("in order that / so that"). että reports what did happen as a consequence; jotta states the goal you are aiming at.

Säästän rahaa, jotta voin matkustaa.

I'm saving money so that I can travel. (purpose)

Olin niin väsynyt, että nukahdin.

I was so tired that I fell asleep. (result)

A quick test: if you can insert "in order to", it is jotta (purpose). If it describes an actual outcome, it is (niin) … että (result). The full comparison lives on että vs jotta.

The big trap: että is not "whether"

English "that" and "whether" are two different words, but learners often stretch että to cover indirect yes/no questions — and that is wrong. An embedded yes/no question is built with the -ko/-kö clitic on the verb, not with että.

En tiedä, tuleeko hän.

I don't know whether he's coming.

Kysyin, onko kauppa auki.

I asked whether the shop is open.

En tiedä, että hän tulee would mean something like "I don't know that he's coming" (i.e. I wasn't aware of it) — a completely different statement. When English uses "whether/if", Finnish reaches for -ko/-kö, never että. See indirect questions for the full picture.

että is a complementiser, not a relative pronoun

English "that" also doubles as a relative pronoun ("the man that called"). Finnish keeps these jobs strictly apart: että is only a complementiser, and the relative pronoun is joka.

Mies, joka soitti, oli isäni.

The man who/that called was my father.

Kirja, jonka luin, oli tylsä.

The book that I read was boring.

Using että here (Mies, että soitti) is a straight error. If "that" could be swapped for "which/who" in English, Finnish needs joka, not että. The relative pronoun is covered on the relative pronoun joka.

The referatiivi alternative

In more compact or formal style, Finnish can replace an että-clause with the referative construction (referatiivirakenne): a participle plus a possessive suffix instead of a full clause. Sanon, että tulen can become Sanon tulevani ("I say I'll come"), with tulevani = present participle tuleva + the 1st-person possessive -ni.

Luulen tulevani ajoissa.

I think I'll come on time. (= Luulen, että tulen ajoissa.)

Hän sanoi olevansa väsynyt.

She said she was tired. (= Hän sanoi, että hän on väsynyt.)

The referative version has no comma and no että, and it works cleanly only when the subject of the reported clause is understood from the possessive suffix. It reads as (formal) or literary; in conversation the että-clause is far more common. Beginners should master the että-clause first and treat the referative as a later, elegant option.

Common Mistakes

❌ Luulen että hän tulee.

Incorrect — a comma is required before että.

✅ Luulen, että hän tulee.

I think that she's coming.

❌ En tiedä, että hän tulee. (meaning 'whether')

Incorrect for 'whether' — an indirect yes/no question needs -ko, not että.

✅ En tiedä, tuleeko hän.

I don't know whether he's coming.

❌ Mies, että soitti, oli isäni.

Incorrect — a relative clause needs joka, not että.

✅ Mies, joka soitti, oli isäni.

The man who called was my father.

❌ Säästän rahaa, että voin matkustaa.

Incorrect for purpose — 'in order that' is jotta, not plain että.

✅ Säästän rahaa, jotta voin matkustaa.

I'm saving money so that I can travel.

Key Takeaways

että = "that" (complementiser) after verbs of saying/thinking; the clause keeps normal word order and takes a comma before että.
niin … että = "so … that" (result); jotta = "in order that" (purpose).
For "whether/if", use -ko/-kö, not että. For a relative "that", use joka.
The referatiivi (Sanon tulevani) is a compact (formal) substitute for an että-clause.

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